8x²+4x-21+6x²-14+7 berikan jalannya

8x²+4x-21+6x²-14+7
8x²+6x²+4x-7-21
14x²-4x-28
_________(÷2)
7x²-2x-14
maaf kalo salahhh

=> 8x^2 + 4x - 21 + 6x^2 - 14 + 7
=> 8x^2 + 6x^2 + 4x - 21 - 14 + 7
=> 14x^2 + 4x - 28
----------------------------- (:2)
=> 7x^2 + 2x - 14